diff options
| author | Nicolin Chen <b42378@freescale.com> | 2013-10-23 11:47:43 +0800 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2013-10-24 09:20:47 +0200 |
| commit | 055032142c42d2821c4aa617915292d6a08d56fc (patch) | |
| tree | ce10032a40379b482eda19f8b04f8924a1625195 /include/sound | |
| parent | 861e66d3418a90f57b31a50110fc70b23569c551 (diff) | |
ALSA: Add SoC on-chip internal ram support for DMA buffer allocation
Now it's quite common that an SoC contains its on-chip internal RAM.
By using this RAM space for DMA buffer during audio playback/record,
we can shutdown the voltage for external RAM to save power.
So add new DEV type with iram malloc()/free() and accordingly modify
current default mmap() for the iram circumstance.
Signed-off-by: Nicolin Chen <b42378@freescale.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound')
| -rw-r--r-- | include/sound/memalloc.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h index cf15b8213df7..510aec437f72 100644 --- a/include/sound/memalloc.h +++ b/include/sound/memalloc.h @@ -52,6 +52,7 @@ struct snd_dma_device { #else #define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */ #endif +#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */ /* * info for buffer allocation |